1. Lesson 91 Warm Up
Pg. 474

2. Course 1 Lesson 91
Geometric Formulas

3. Formulas Figure Perimeter Area Square Rectangle Parallelogram Triangle
P = 4s
P = 2l + 2w
P = 2b + 2s
P = s1 + s2 + s3
A = s2
A = lw
A = bh
A = ½bh
Square
Parallelogram
Rectangle
Height (h)
Width (w)
Side (s)
Side (s)
Length (l)
Base (b)

4. Example
Write the formula for the perimeter of a rectangle. Then substitute 8 cm for the length and 5 cm for the width. Solve the equation to find P.

5. Lesson 91 Homework
Pg. 476 Practice, #1-10, WS #91